Thanks Jake and great work.
Andy – Please provide a description in the upcoming Ops report that we have made repairs to the system that should see a $23K-$33K savings in the sewer budget now that the system is operating more efficiently.
Regards,
Gerald Fisher, P.E. | Public Works Director
City of Molalla
117 N Molalla Ave. | PO Box 248 |Molalla, OR 97038
Office: 503.829.6855 | Direct: 503.759.0218
CONFIDENTIALITY NOTICE: The information contained in this email message, including any attachments, is for the sole use of the intended recipient(s) and may contain confidential and privileged information. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient and have received this communication in error, please contact the sender by reply email and destroy all copies of the original message. Thank you.
From: Andy Peters <apeters@cityofmolalla.com>
Sent: Wednesday, November 14, 2018 9:06 AM
To: Jake Ehredt <jehredt@cityofmolalla.com>
Cc: Gerald Fisher <gfisher@cityofmolalla.com>
Subject: RE: DMS Vitamin C.
Great analysis Jake!
$23k to $33K savings per winter. Nice…
Andy Peters
City of Molalla
Public Works Operations Supervisor
(503) 829-6855 x220
Cell: 503-793-0507
117 N Molalla Ave
Molalla, OR 97038
From: Jake Ehredt <jehredt@cityofmolalla.com>
Sent: Wednesday, November 14, 2018 9:02 AM
To: Andy Peters <apeters@cityofmolalla.com>
Cc: Gerald Fisher <gfisher@cityofmolalla.com>
Subject: RE: DMS Vitamin C.
Andy,
It takes 1-55lbs box of Vitamin C ( Ascorbic Acid) to 1 foot of water. 1 Foot of water in the day tank is equivalent to 111.6 gals or 9.3 gallons per in. This make the concentration approximately 2.5 ppm Ascorbic acid to neutralize 1 ppm Chlorine.
The current price of Vit.C as of 11-13-2018 is $4.48Lb/ 55Lbs box = $246.40/ Pallet = $8870.40
When we started up, we were using approximately 3 feet a day which equal 3 Boxes Ascorbic acid. $739.00( current price per Lbs.) a day. After we had fixed the line, we were using approximately 1 foot per day which equals 1 box Ascorbic acid. $246 a day.
Although looking back through the first part of the 2018 winter discharge season DMS sheets ( Jan-May) we were using 170 gallons of Ascorbic acid per day. At this time that was 1 ½ boxes Ascorbic acid being used a per day.
To say that we were using 3ft feet a day would be a little much. The Ascorbic acid line had been leaking for some time, but I don’t think to the extent that we saw in the video base on past records.
At this time after fixing the leak I would say that were able to cut the Ascorbic acid use by ½ a box to ¾ of a box a day from the original use of 1 ½ boxes a day over last year winter discharge season, which would equate to a saving of $23k to $33K per discharge season (Nov.1-April.30)
Jake Ehredt
Lead WWTP Operator
City of Molalla
Cell 971-241-7547
Shop 503-829-5407
CONFIDENTIALITY NOTICE: The information contained in this email message, including any attachments, is for the sole use of the intended recipient(s) and may contain confidential and privileged information. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient and have received this communication in error, please contact the sender by reply email and destroy all copies of the original message. Thank you.
From: Andy Peters
Sent: Tuesday, November 13, 2018 1:11 PM
To: Jake Ehredt <jehredt@cityofmolalla.com>
Cc: Gerald Fisher <gfisher@cityofmolalla.com>
Subject: RE: DMS Vitamin C.
Thank you Jake! Looking at that video I’d say I see 12 drips at 1 drip per second, which is a daily waste of 103.68 gal, 3110.4 gal/month.
- 1. Can you remind me what the concentration of this water is?
- 2. How many lbs of purchased vitamin is needed to mix water to that solution?
- 3. What is the $$/lb we pay for vitamin C right now?